so thank you first :

we take two point for exemple : (0,-1) and (1,-5)

and we have k a^0 = -1 so k= -1

and we have k a^1=-5 with k= -1 so - a^1 = -5 so a = 5

so f(x)= -5^x

Good Luck and please if need something else please call me i will help you

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